Eyewear having a projector with heat sink shields

ABSTRACT

A projector, such as for eyewear, having a first and second shield that individually sink heat from a light source and provide electromagnetic (EM) shielding for the projector, and a processor controlling the projector. The shields sink heat evenly and efficiently, to different portions of the eyewear. In one example, the heat is directed in different directions. The shields encompass the light source and the processor, and they may be parallel to one another. The thickness of the shield coupled to the light source is thicker proximate the light source. The shields may be separated from each other by a thermal insulating material.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to U.S. Provisional Application No.63/178,650 filed on Apr. 23, 2021, the contents of which areincorporated fully herein by reference.

TECHNICAL FIELD

The present subject matter relates to the field of eyewear.

BACKGROUND

Many types of eyewear have projectors that generate an image that isviewable to a user. The eyewear electronics, and the projector generateheat during operation.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawing figures depict one or more implementations, by way ofexample only, not by way of limitations. In the figures, like referencenumerals refer to the same or similar elements.

FIG. 1A is a side view of an example hardware configuration of aneyewear device, which shows a right optical assembly with an imagedisplay, and field of view adjustments are applied to a user interfacepresented on the image display based on detected head or eye movement bya user;

FIG. 1B is a top cross-sectional view of a temple of the eyewear deviceof FIG. 1A depicting a visible light camera, a head movement tracker fortracking the head movement of the user of the eyewear device, and acircuit board;

FIG. 2A is a rear view of an example hardware configuration of aneyewear device, which includes an eye scanner on a frame, for use in asystem for identifying a user of the eyewear device;

FIG. 2B is a rear view of an example hardware configuration of anothereyewear device, which includes an eye scanner on a temple, for use in asystem for identifying a user of the eyewear device;

FIGS. 2C and 2D are rear views of example hardware configurations of theeyewear device, including two different types of image displays:

FIG. 3 shows a rear perspective view of the eyewear device of FIG. 2Adepicting an infrared emitter, an infrared camera, a frame front, aframe back, and a circuit board;

FIG. 4 is a cross-sectional view taken through the infrared emitter andthe frame of the eyewear device of FIG. 3;

FIG. 5 illustrates detecting eye gaze direction;

FIG. 6 illustrates detecting eye position;

FIG. 7 depicts an example of visible light captured by the left visiblelight camera as a left raw image and visible light captured by the rightvisible light camera as a right raw image;

FIG. 8A is a side view of a projector configured to generate a visualimage;

FIG. 8B is a side sectional view of a housing that encompasses thecomponents of the system described with reference to FIG. 8A;

FIG. 8C illustrates the portion of the system that is an illuminationsection of projector, and the portion of projector that is a projectionlens;

FIG. 8D illustrates graphs of system dimensions as a function of thecurvature of the field lens;

FIG. 8E illustrates a method of generating a decentered light beam usingthe field lens, and displacing a display to generate a display image;

FIG. 9 illustrates a block diagram of electronic components of theeyewear device including the projector;

FIG. 10A and FIG. 10B illustrate the two separated shields enclosing aprojector, where FIG. 10B shows the projector of FIG. 10A rotated 180degrees;

FIG. 11A and FIG. 11B illustrate the heat performance of each shield;

FIG. 12 illustrates another example of the shields and the adapter;

FIG. 13A and FIG. 13B illustrate the heat performance of the shields ofFIG. 12; and

FIG. 14 illustrates a method of operating the projector with theshields.

DETAILED DESCRIPTION

This disclosure is directed to a projector, such as for eyewear, havinga first and second shield that individually sink heat from a lightsource and provide electromagnetic (EM) shielding for the projector, anda processor controlling the projector. The shields sink heat evenly andefficiently, to different portions of the eyewear. In one example, theheat is directed in different directions. The shields encompass thelight source and the processor, and they may be parallel to one another.The thickness of the shield coupled to the light source is thickerproximate the light source. The shields may be separated from each otherby a thermal insulating material.

Additional objects, advantages and novel features of the examples willbe set forth in part in the description which follows, and in part willbecome apparent to those skilled in the art upon examination of thefollowing and the accompanying drawings or may be learned by productionor operation of the examples. The objects and advantages of the presentsubject matter may be realized and attained by means of themethodologies, instrumentalities and combinations particularly pointedout in the appended claims.

In the following detailed description, numerous specific details are setforth by way of examples in order to provide a thorough understanding ofthe relevant teachings. However, it should be apparent to those skilledin the art that the present teachings may be practiced without suchdetails. In other instances, well known methods, procedures, components,and circuitry have been described at a relatively high-level, withoutdetail, in order to avoid unnecessarily obscuring aspects of the presentteachings.

The term “coupled” as used herein refers to any logical, optical,physical or electrical connection, link or the like by which signals orlight produced or supplied by one system element are imparted to anothercoupled element. Unless described otherwise, coupled elements or devicesare not necessarily directly connected to one another and may beseparated by intermediate components, elements or communication mediathat may modify, manipulate or carry the light or signals.

The orientations of the eyewear device, associated components and anycomplete devices incorporating an eye scanner and camera such as shownin any of the drawings, are given by way of example only, forillustration and discussion purposes. In operation for a particularvariable optical processing application, the eyewear device may beoriented in any other direction suitable to the particular applicationof the eyewear device, for example up, down, sideways, or any otherorientation. Also, to the extent used herein, any directional term, suchas front, rear, inwards, outwards, towards, left, right, lateral,longitudinal, up, down, upper, lower, top, bottom and side, are used byway of example only, and are not limiting as to direction or orientationof any optic or component of an optic constructed as otherwise describedherein.

Reference now is made in detail to the examples illustrated in theaccompanying drawings and discussed below.

FIG. 1A is a side view of an example hardware configuration of aneyewear device 100, which includes a right optical assembly 180B with animage display 180D (FIG. 2A). Eyewear device 100 includes multiplevisible light cameras 114A-B (FIG. 7) that form a stereo camera, ofwhich the right visible light camera 114B is located on a right temple110B.

The left and right visible light cameras 114A-B have an image sensorthat is sensitive to the visible light range wavelength. Each of thevisible light cameras 114A-B have a different frontward facing angle ofcoverage, for example, visible light camera 114B has the depicted angleof coverage 111B. The angle of coverage is an angle range which theimage sensor of the visible light camera 114A-B picks up electromagneticradiation and generates images. Examples of such visible lights camera114A-B include a high-resolution complementary metal-oxide-semiconductor(CMOS) image sensor and a video graphic array (VGA) camera, such as 640p(e.g., 640×480 pixels for a total of 0.3 megapixels), 720p, or 1080p.Image sensor data from the visible light cameras 114A-B are capturedalong with geolocation data, digitized by an image processor, and storedin a memory.

To provide stereoscopic vision, visible light cameras 114A-B may becoupled to an image processor (element 912 of FIG. 9) for digitalprocessing along with a timestamp in which the image of the scene iscaptured. Image processor 912 includes circuitry to receive signals fromthe visible light camera 114A-B and process those signals from thevisible light cameras 114A-B into a format suitable for storage in thememory (element 934 of FIG. 9). The timestamp can be added by the imageprocessor 912 or other processor, which controls operation of thevisible light cameras 114A-B. Visible light cameras 114A-B allow thestereo camera to simulate human binocular vision. Stereo cameras providethe ability to reproduce three-dimensional images (element 715 of FIG.7) based on two captured images (elements 758A-B of FIG. 7) from thevisible light cameras 114A-B, respectively, having the same timestamp.Such three-dimensional images 715 allow for an immersive life-likeexperience, e.g., for virtual reality or video gaming. For stereoscopicvision, the pair of images 758A-B are generated at a given moment intime—one image for each of the left and right visible light cameras114A-B. When the pair of generated images 758A-B from the frontwardfacing field of view (FOV) 111A-B of the left and right visible lightcameras 114A-B are stitched together (e.g., by the image processor 912),depth perception is provided by the optical assembly 180A-B.

In an example, a user interface field of view adjustment system includesthe eyewear device 100. The eyewear device 100 includes a frame 105, aright temple 110B extending from a right lateral side 170B of the frame105, and a see-through image display 180D (FIGS. 2A-B) comprisingoptical assembly 180B to present a graphical user interface to a user.The eyewear device 100 includes the left visible light camera 114Aconnected to the frame 105 or the left temple 110A to capture a firstimage of the scene. Eyewear device 100 further includes the rightvisible light camera 114B connected to the frame 105 or the right temple110B to capture (e.g., simultaneously with the left visible light camera114A) a second image of the scene which partially overlaps the firstimage. Although not shown in FIGS. 1A-B, the user interface field ofview adjustment system further includes the processor 932 coupled to theeyewear device 100 and connected to the visible light cameras 114A-B,the memory 934 accessible to the processor 932, and programming in thememory 934, for example in the eyewear device 100 itself or another partof the user interface field of view adjustment system.

Although not shown in FIG. 1A, the eyewear device 100 also includes ahead movement tracker (element 109 of FIG. 1B) or an eye movementtracker (element 213 of FIG. 2B). Eyewear device 100 further includesthe see-through image displays 180C-D of optical assembly 180A-B,respectfully, for presenting a sequence of displayed images, and animage display driver (element 942 of FIG. 9) coupled to the see-throughimage displays 180C-D of optical assembly 180A-B to control the imagedisplays 180C-D of optical assembly 180A-B to present the sequence ofdisplayed images 715, which are described in further detail below.Eyewear device 100 further includes the memory 934 and the processor 932having access to the image display driver 942 and the memory 934.Eyewear device 100 further includes programming (element 934 of FIG. 9)in the memory. Execution of the programming by the processor 932configures the eyewear device 100 to perform functions, includingfunctions to present, via the see-through image displays 180C-D, aninitial displayed image of the sequence of displayed images, the initialdisplayed image having an initial field of view corresponding to aninitial head direction or an initial eye gaze direction (element 230 ofFIG.5).

Execution of the programming by the processor 932 further configures theeyewear device 100 to detect movement of a user of the eyewear deviceby: (i) tracking, via the head movement tracker (element 109 of FIG.1B), a head movement of a head of the user, or (ii) tracking, via an eyemovement tracker (element 213 of FIG. 2B, FIG. 5), an eye movement of aneye of the user of the eyewear device 100. Execution of the programmingby the processor 932 further configures the eyewear device 100 todetermine a field of view adjustment to the initial field of view of theinitial displayed image based on the detected movement of the user. Thefield of view adjustment includes a successive field of viewcorresponding to a successive head direction or a successive eyedirection. Execution of the programming by the processor 932 furtherconfigures the eyewear device 100 to generate a successive displayedimage of the sequence of displayed images based on the field of viewadjustment. Execution of the programming by the processor 932 furtherconfigures the eyewear device 100 to present, via the see-through imagedisplays 180C-D of the optical assembly 180A-B, the successive displayedimages.

FIG. 1B is a top cross-sectional view of the temple of the eyeweardevice 100 of FIG. 1A depicting the right visible light camera 114B, ahead movement tracker 109, and a circuit board. Construction andplacement of the left visible light camera 114A is substantially similarto the right visible light camera 114B, except the connections andcoupling are on the left lateral side 170A. As shown, the eyewear device100 includes the right visible light camera 114B and a circuit board,which may be a flexible printed circuit board (PCB) 140. The right hinge126B connects the right temple 110B to a right temple 125B of theeyewear device 100. In some examples, components of the right visiblelight camera 114B, the flexible PCB 140, or other electrical connectorsor contacts may be located on the right temple 125B or the right hinge126B.

As shown, eyewear device 100 has a head movement tracker 109, whichincludes, for example, an inertial measurement unit (IMU). An inertialmeasurement unit is an electronic device that measures and reports abody's specific force, angular rate, and sometimes the magnetic fieldsurrounding the body, using a combination of accelerometers andgyroscopes, sometimes also magnetometers. The inertial measurement unitworks by detecting linear acceleration using one or more accelerometersand rotational rate using one or more gyroscopes. Typical configurationsof inertial measurement units contain one accelerometer, gyro, andmagnetometer per axis for each of the three axes: horizontal axis forleft-right movement (X), vertical axis (Y) for top-bottom movement, anddepth or distance axis for up-down movement (Z). The accelerometerdetects the gravity vector. The magnetometer defines the rotation in themagnetic field (e.g., facing south, north, etc.) like a compass whichgenerates a heading reference. The three accelerometers to detectacceleration along the horizontal, vertical, and depth axis definedabove, which can be defined relative to the ground, the eyewear device100, or the user wearing the eyewear device 100.

Eyewear device 100 detects movement of the user of the eyewear device100 by tracking, via the head movement tracker 109, the head movement ofthe head of the user. The head movement includes a variation of headdirection on a horizontal axis, a vertical axis, or a combinationthereof from the initial head direction during presentation of theinitial displayed image on the image display. In one example, tracking,via the head movement tracker 109, the head movement of the head of theuser includes measuring, via the inertial measurement unit 109, theinitial head direction on the horizontal axis (e.g., X axis), thevertical axis (e.g., Y axis), or the combination thereof (e.g.,transverse or diagonal movement). Tracking, via the head movementtracker 109, the head movement of the head of the user further includesmeasuring, via the inertial measurement unit 109, a successive headdirection on the horizontal axis, the vertical axis, or the combinationthereof during presentation of the initial displayed image.

Tracking, via the head movement tracker 109, the head movement of thehead of the user further includes determining the variation of headdirection based on both the initial head direction and the successivehead direction. Detecting movement of the user of the eyewear device 100further includes in response to tracking, via the head movement tracker109, the head movement of the head of the user, determining that thevariation of head direction exceeds a deviation angle threshold on thehorizontal axis, the vertical axis, or the combination thereof. Thedeviation angle threshold is between about 3° to 10°. As used herein,the term “about” when referring to an angle means ±10% from the statedamount.

Variation along the horizontal axis slides three-dimensional objects,such as characters, Bitmojis, application icons, etc. in and out of thefield of view by, for example, hiding, unhiding, or otherwise adjustingvisibility of the three-dimensional object. Variation along the verticalaxis, for example, when the user looks upwards, in one example, displaysweather information, time of day, date, calendar appointments, etc. Inanother example, when the user looks downwards on the vertical axis, theeyewear device 100 may power down.

The right temple 110B includes temple body 211 and a temple cap, withthe temple cap omitted in the cross-section of FIG. 1B. Disposed insidethe right temple 110B are various interconnected circuit boards, such asPCBs or flexible PCBs, that include controller circuits for rightvisible light camera 114B, microphone(s) 130, speaker(s) 132, low-powerwireless circuitry (e.g., for wireless short-range network communicationvia Bluetooth™), high-speed wireless circuitry (e.g., for wireless localarea network communication via WiFi).

The right visible light camera 114B is coupled to or disposed on theflexible PCB 240 and covered by a visible light camera cover lens, whichis aimed through opening(s) formed in the right temple 110B. In someexamples, the frame 105 connected to the right temple 110B includes theopening(s) for the visible light camera cover lens. The frame 105includes a front-facing side configured to face outwards away from theeye of the user. The opening for the visible light camera cover lens isformed on and through the front-facing side. In the example, the rightvisible light camera 114B has an outward facing angle of coverage 111Bwith a line of sight or perspective of the right eye of the user of theeyewear device 100. The visible light camera cover lens can also beadhered to an outward facing surface of the right temple 110B in whichan opening is formed with an outward facing angle of coverage, but in adifferent outwards direction. The coupling can also be indirect viaintervening components.

Left (first) visible light camera 114A is connected to the leftsee-through image display 180C of left optical assembly 180A to generatea first background scene of a first successive displayed image. Theright (second) visible light camera 114B is connected to the rightsee-through image display 180D of right optical assembly 180B togenerate a second background scene of a second successive displayedimage. The first background scene and the second background scenepartially overlap to present a three-dimensional observable area of thesuccessive displayed image.

Flexible PCB 140 is disposed inside the right temple 110B and is coupledto one or more other components housed in the right temple 110B.Although shown as being formed on the circuit boards of the right temple110B, the right visible light camera 114B can be formed on the circuitboards of the left temple 110A, the temples 125A-B, or frame 105.

FIG. 2A is a rear view of an example hardware configuration of aneyewear device 100, which includes an eye scanner 113 on a frame 105,for use in a system for determining an eye position and gaze directionof a wearer/user of the eyewear device 100. As shown in FIG. 2A, theeyewear device 100 is in a form configured for wearing by a user, whichare eyeglasses in the example of FIG. 2A. The eyewear device 100 cantake other forms and may incorporate other types of frameworks, forexample, a headgear, a headset, or a helmet.

In the eyeglasses example, eyewear device 100 includes the frame 105which includes the left rim 107A connected to the right rim 107B via thebridge 106 adapted for a nose of the user. The left and right rims107A-B include respective apertures 175A-B which hold the respectiveoptical element 180A-B, such as a lens and the see-through displays180C-D. As used herein, the term lens is meant to cover transparent ortranslucent pieces of glass or plastic having curved and flat surfacesthat cause light to converge/diverge or that cause little or noconvergence/divergence.

Although shown as having two optical elements 180A-B, the eyewear device100 can include other arrangements, such as a single optical elementdepending on the application or intended user of the eyewear device 100.As further shown, eyewear device 100 includes the left temple 110Aadjacent the left lateral side 170A of the frame 105 and the righttemple 110B adjacent the right lateral side 170B of the frame 105. Thetemples 110A-B may be integrated into the frame 105 on the respectivesides 170A-B (as illustrated) or implemented as separate componentsattached to the frame 105 on the respective sides 170A-B. Alternatively,the temples 110A-B may be integrated into temples (not shown) attachedto the frame 105.

In the example of FIG. 2A, the eye scanner 113 includes an infraredemitter 115 and an infrared camera 120. Visible light cameras typicallyinclude a blue light filter to block infrared light detection, in anexample, the infrared camera 120 is a visible light camera, such as alow-resolution video graphic array (VGA) camera (e.g., 640×480 pixelsfor a total of 0.3 megapixels), with the blue filter removed. Theinfrared emitter 115 and the infrared camera 120 are co-located on theframe 105, for example, both are shown as connected to the upper portionof the left rim 107A. The frame 105 or one or more of the left and righttemples 110A-B include a circuit board (not shown) that includes theinfrared emitter 115 and the infrared camera 120. The infrared emitter115 and the infrared camera 120 can be connected to the circuit board bysoldering, for example.

Other arrangements of the infrared emitter 115 and infrared camera 120can be implemented, including arrangements in which the infrared emitter115 and infrared camera 120 are both on the right rim 107B, or indifferent locations on the frame 105, for example, the infrared emitter115 is on the left rim 107A and the infrared camera 120 is on the rightrim 107B. In another example, the infrared emitter 115 is on the frame105 and the infrared camera 120 is on one of the temples 110A-B, or viceversa. The infrared emitter 115 can be connected essentially anywhere onthe frame 105, left temple 110A, or right temple 110B to emit a patternof infrared light. Similarly, the infrared camera 120 can be connectedessentially anywhere on the frame 105, left temple 110A, or right temple110B to capture at least one reflection variation in the emitted patternof infrared light.

The infrared emitter 115 and infrared camera 120 are arranged to faceinwards towards an eye of the user with a partial or full field of viewof the eye in order to identify the respective eye position and gazedirection. For example, the infrared emitter 115 and infrared camera 120are positioned directly in front of the eye, in the upper part of theframe 105 or in the temples 110A-B at either ends of the frame 105.

FIG. 2B is a rear view of an example hardware configuration of anothereyewear device 200. In this example configuration, the eyewear device200 is depicted as including an eye scanner 213 on a right temple 210B.As shown, an infrared emitter 215 and an infrared camera 220 areco-located on the right temple 210B. It should be understood that theeye scanner 213 or one or more components of the eye scanner 213 can belocated on the left temple 210A and other locations of the eyeweardevice 200, for example, the frame 105. The infrared emitter 215 andinfrared camera 220 are like that of FIG. 2A, but the eye scanner 213can be varied to be sensitive to different light wavelengths asdescribed previously in FIG. 2A.

Similar to FIG. 2A, the eyewear device 200 includes a frame 105 whichincludes a left rim 107A which is connected to a right rim 107B via abridge 106; and the left and right rims 107A-B include respectiveapertures which hold the respective optical elements 180A-B comprisingthe see-through display 180C-D.

FIGS. 2C-D are rear views of example hardware configurations of theeyewear device 100, including two different types of see-through imagedisplays 180C-D. In one example, these see-through image displays 180C-Dof optical assembly 180A-B include an integrated image display. As shownin FIG. 2C, the optical assemblies 180A-B includes a suitable displaymatrix 180C-D of any suitable type, such as a liquid crystal display(LCD), an organic light-emitting diode (OLED) display, a waveguidedisplay, or any other such display.

The optical assembly 180A-B also includes an optical layer or layers176, which can include lenses, optical coatings, prisms, mirrors,waveguides, optical strips, and other optical components in anycombination. The optical layers 176A-N can include a prism having asuitable size and configuration and including a first surface forreceiving light from display matrix and a second surface for emittinglight to the eye of the user. The prism of the optical layers 176A-Nextends over all or at least a portion of the respective apertures175A-B formed in the left and right rims 107A-B to permit the user tosee the second surface of the prism when the eye of the user is viewingthrough the corresponding left and right rims 107A-B. The first surfaceof the prism of the optical layers 176A-N faces upwardly from the frame105 and the display matrix overlies the prism so that photons and lightemitted by the display matrix impinge the first surface. The prism issized and shaped so that the light is refracted within the prism and isdirected towards the eye of the user by the second surface of the prismof the optical layers 176A-N. In this regard, the second surface of theprism of the optical layers 176A-N can be convex to direct the lighttowards the center of the eye. The prism can optionally be sized andshaped to magnify the image projected by the see-through image displays180C-D, and the light travels through the prism so that the image viewedfrom the second surface is larger in one or more dimensions than theimage emitted from the see-through image displays 180C-D.

In another example, the see-through image displays 180C-D of opticalassembly 180A-B include a projection image display as shown in FIG. 2D.The optical assembly 180A-B includes a projector 150, which may be athree-color projector using a scanning mirror, a galvanometer, a laserprojector, or other types of projectors. During operation, an opticalsource such as a projector 150 is disposed in or on one of the temples125A-B of the eyewear device 100. Optical assembly 180A-B includes oneor more optical strips 155A-N spaced apart across the width of the lensof the optical assembly 180A-B or across a depth of the lens between thefront surface and the rear surface of the lens. A detailed example of aprojector is shown in FIGS. 8A-8E.

As the photons projected by the projector 150 travel across the lens ofthe optical assembly 180A-B, the photons encounter the optical strips155A-N. When a particular photon encounters a particular optical strip,the photon is either redirected towards the user's eye, or it passes tothe next optical strip. A combination of modulation of projector 150,and modulation of optical strips, may control specific photons or beamsof light. In an example, a processor controls optical strips 155A-N byinitiating mechanical, acoustic, or electromagnetic signals. Althoughshown as having two optical assemblies 180A-B, the eyewear device 100can include other arrangements, such as a single or three opticalassemblies, or the optical assembly 180A-B may have arranged differentarrangement depending on the application or intended user of the eyeweardevice 100.

As further shown in FIGS. 2C-D, eyewear device 100 includes a lefttemple 110A adjacent the left lateral side 170A of the frame 105 and aright temple 110B adjacent the right lateral side 170B of the frame 105.The temples 110A-B may be integrated into the frame 105 on therespective lateral sides 170A-B (as illustrated) or implemented asseparate components attached to the frame 105 on the respective sides170A-B. Alternatively, the temples 110A-B may be integrated into temples125A-B attached to the frame 105.

In one example, the see-through image displays include the firstsee-through image display 180C and the second see-through image display180D. Eyewear device 100 includes first and second apertures 175A-Bwhich hold the respective first and second optical assembly 180A-B. Thefirst optical assembly 180A includes the first see-through image display180C (e.g., a display matrix of FIG. 2C or optical strips and aprojector (not shown)). The second optical assembly 180B includes thesecond see-through image display 180D (e.g., a display matrix of FIG. 2Cor optical strips 155A-N and a projector 150). The successive field ofview of the successive displayed image includes an angle of view betweenabout 15° to 30, and more specifically 24°, measured horizontally,vertically, or diagonally. The successive displayed image having thesuccessive field of view represents a combined three-dimensionalobservable area visible through stitching together of two displayedimages presented on the first and second image displays.

As used herein, “an angle of view” describes the angular extent of thefield of view associated with the displayed images presented on each ofthe left and right image displays 180C-D of optical assembly 180A-B. The“angle of coverage” describes the angle range that a lens of visiblelight cameras 114A-B or infrared camera 220 can image. Typically, theimage circle produced by a lens is large enough to cover the film orsensor completely, possibly including some vignetting (i.e., a reductionof an image's brightness or saturation toward the periphery compared tothe image center). If the angle of coverage of the lens does not fillthe sensor, the image circle will be visible, typically with strongvignetting toward the edge, and the effective angle of view will belimited to the angle of coverage. The “field of view” is intended todescribe the field of observable area which the user of the eyeweardevice 100 can see through his or her eyes via the displayed imagespresented on the left and right image displays 180C-D of the opticalassembly 180A-B. Image display 180C of optical assembly 180A-B can havea field of view with an angle of coverage between 15° to 30°, forexample 24°, and have a resolution of 480×480 pixels.

FIG. 3 shows a rear perspective view of the eyewear device of FIG. 2A.The eyewear device 100 includes an infrared emitter 215, infrared camera220, a frame front 330, a frame back 335, and a circuit board 340. Itcan be seen in FIG. 3 that the upper portion of the left rim of theframe of the eyewear device 100 includes the frame front 330 and theframe back 335. An opening for the infrared emitter 215 is formed on theframe back 335.

As shown in the encircled cross-section 4 in the upper middle portion ofthe left rim of the frame, a circuit board, which is a flexible PCB 340,is sandwiched between the frame front 330 and the frame back 335. Alsoshown in further detail is the attachment of the left temple 110A to theleft temple 325A via the left hinge 126A. In some examples, componentsof the eye movement tracker 213, including the infrared emitter 215, theflexible PCB 340, or other electrical connectors or contacts may belocated on the left temple 325A or the left hinge 126A.

FIG. 4 is a cross-sectional view through the infrared emitter 215 andthe frame corresponding to the encircled cross-section 4 of the eyeweardevice of FIG. 3. Multiple layers of the eyewear device 100 areillustrated in the cross-section of FIG. 4, as shown the frame includesthe frame front 330 and the frame back 335. The flexible PCB 340 isdisposed on the frame front 330 and connected to the frame back 335. Theinfrared emitter 215 is disposed on the flexible PCB 340 and covered byan infrared emitter cover lens 445. For example, the infrared emitter215 is reflowed to the back of the flexible PCB 340. Reflowing attachesthe infrared emitter 215 to contact pad(s) formed on the back of theflexible PCB 340 by subjecting the flexible PCB 340 to controlled heatwhich melts a solder paste to connect the two components. In oneexample, reflowing is used to surface mount the infrared emitter 215 onthe flexible PCB 340 and electrically connect the two components.However, it should be understood that through-holes can be used toconnect leads from the infrared emitter 215 to the flexible PCB 340 viainterconnects, for example.

The frame back 335 includes an infrared emitter opening 450 for theinfrared emitter cover lens 445. The infrared emitter opening 450 isformed on a rear-facing side of the frame back 335 that is configured toface inwards towards the eye of the user. In the example, the flexiblePCB 340 can be connected to the frame front 330 via the flexible PCBadhesive 460. The infrared emitter cover lens 445 can be connected tothe frame back 335 via infrared emitter cover lens adhesive 455. Thecoupling can also be indirect via intervening components.

In an example, the processor 932 utilizes eye tracker 213 to determinean eye gaze direction 230 of a wearer's eye 234 as shown in FIG. 5, andan eye position 236 of the wearer's eye 234 within an eyebox as shown inFIG. 6. The eye tracker 213 is a scanner which uses infrared lightillumination (e.g., near-infrared, short-wavelength infrared,mid-wavelength infrared, long-wavelength infrared, or far infrared) tocaptured image of reflection variations of infrared light from the eye234 to determine the gaze direction 230 of a pupil 232 of the eye 234,and also the eye position 236 with respect to the see-through display180D.

FIG. 7 depicts an example of capturing visible light with cameras114A-B. Visible light is captured by the left visible light camera 114Awith a round field of view (FOV). 111A. A chosen rectangular left rawimage 758A is used for image processing by image processor 912 (FIG. 9).Visible light is captured by the right visible light camera 114B with around FOV 111B that overlaps 713 the round FOV 111A. A rectangular rightraw image 758B chosen by the image processor 912 is used for imageprocessing by processor 912. Based on processing of the left raw image758A and the right raw image 758B, a three-dimensional image 715 of athree-dimensional scene, referred to hereafter as an immersive image, isgenerated by processor 912 and displayed by displays 180C and 180D andwhich is viewable by the user.

FIG. 8A is a side view of a projector 150 configured to generate animage, such as shown and described as projector 150 in FIG. 2D.Projector 150 includes a display 812 configured to modulate light beamsimpinging thereon from one or more colored light sources to generate theimage, shown as a red/blue light-emitting diode (LED) light 814 and agreen LED light 816. The red/blue LED light 814 selectively emits a redand blue light beam 832 that passes through respective condenser lenses818, reflects off a dichroic lens 820, through a fly's eye 822, througha powered prism 824 and a reverse total internal reflection (RTIR) lightprism 826 separated from each other by a plano spacer 828, and output ata bottom output 830 of RTIR light prism 826 to display 812 as shown. Thegreen light 816 selectively emits a green light beam 832 throughrespective condenser lenses 818 and passes through the dichroic lens820, fly's eye 822, through the powered prism 824 and the RTIR lightprism 826, and output from the bottom RTIR light prism output 830 todisplay 812. The colored lights 814 and 816 are time sequenced by alight controller 829 so that only one light is on at a time, and thedisplay 812 modulates only one colored light beam 832 at a time. Themodulated light from the display 812 creates an image that is directedback into RTIR light prism 826 through bottom output 830, reflects offplano spacer 828, and exits through a vertical RTIR light prism output834 to projection lens elements 836 for display on an image plane. Thehuman eye integrates the modulated colored light beams displayed on theimage plane to perceive a color image. The display 812 may be a digitalmicromirror device (DMD)® display manufactured by Texas Instruments ofDallas, Tex., although other displays are possible. Only this portion ofthe projector 810 described herein so far is a known digital lightprojection (DLP)® system architecture such as manufactured by TexasInstruments of Dallas, Tex.

To increase a field of view (FOV) of this described DLP® projector froma diagonal 25-degree FOV to a diagonal 46-degree FOV, and maintainingresolution and display pixel pitch, this would result in a 1.9X scale ofthe display image diagonal. By maintaining the projection lens f-stopnumber (f/#) and maintaining telecentricity at the projection lens, thisincrease in display diagonal would typically translate into a direct1.9X scale of the diameter of the largest element in the projectionlens. Additionally, due to the need to pass the colored light beamsthrough the RTIR prism 26, the back focal length of the projection lenswould also scale, resulting in an overall length increase as well.

According to this disclosure, as shown and described with reference toFIG. 8A-FIG. 8E, by incorporating a positive power field lens, theprojection lens telecentricity is maintained, but the ray bundle at thelast element is significantly reduced, also reducing the size needed forthe back focal length and overall length of the projection lens. A fieldlens is a positive-powered lens that comes after an objective lens andbefore an image plane. Additional benefit is seen on the illuminationside of the projector, as the size of the powered prism 24 surfaces arereduced due to the power in the field lens. In this disclosure, theselected field lens power is reduced the size by 17% in each dimension(x, y, z).

There is, however, a challenge that a field lens presents specificallyfor a DLP® display projector. A DLP® display projector requiresillumination of the DMD® display 812 at a large 34-degree input angle,and a field lens centered over the DMD® display 812 poses a problem ofuniform illumination on one side of the DMD® display 812. According tothis disclosure, to overcome this limitation, the projection lens isdesigned to support a much larger image circle diameter, and further,the display 812 is laterally displaced/shifted in the image plane towarda more uniform position. This display 812 displacement results in aboresight shift (i.e., the FOV of the projector is shifted from beingparallel to the optical axis of rotational symmetry). This isadvantageous in an augmented reality (AR) system because this enablesthe projector at a non-normal angle to a waveguide, such as used ineyewear optics, allowing for more a better fit in the industrial designsupporting a larger pantoscopic tilt.

According to this disclosure, a curved field lens 840 is coupledadjacent to a bottom prism face 831 forming the bottom output 830 of theRTIR light prism 826. The curved field lens 840 is configured todecenter and angle the colored light beams 832 away from the bottomprism face 831 an angle A as shown, and evenly illuminate the display812 that is shifted to the right in the image plane. The field lens 840angles the light beams 832 at angle A with respect to a normal of thebottom prism face 831, such that the light beams 832 are not outputperpendicular to the normal of prism face 831. The curved field lens 840has an optical axis that is off center from a center of the prism face831.

A center 846 of the display 812 is shifted to the right of a center 844of the bottom prism face 831 a distance D. The decentering of thecolored light beams 832 generated by field lens 840, andshifting/positioning of the display 812, results in a favorable shiftedboresight image generated by display 812 as indicated at 838 that exitsthe projection lens elements 836. The curved field lens 840 enables useof smaller system components, wherein the greater the curvature of thecurved field lens 840 the smaller projector 150, as will be discussedwith reference to FIG. 8D.

Referring to FIG. 8B, there is shown a side sectional view of a housing860 that encompasses the components of projector 150 described withreference to FIG. 8A. The housing 860 may comprise of a material thatcan withstand elevated temperatures, such as generated by the lightbeams 832, such as metal or synthetic materials.

Referring to FIG. 8C, there is illustrated the portion of projector 150that is the illumination section 870 of projector 150, and the portionof projector 150 that is the projection lens 872. The illuminationsection 870 is considered to extend from the light 816 to the verticaloutput 834 formed by a vertical prism face of the RTIR light prism 826proximate the projection lens elements 836. The projection lens 872 isconsidered to extend from the left side of projection lens 840 to theright end of the projection lens elements 836.

Referring to FIG. 8D, there is shown graphs of system dimensions as afunction of the curvature of the field lens 840.

Graph A depicts the width dimension of the prism face 31 of RTIR lightprism 826 at output 830 as a function of the curvature of field lens840. As can be seen, the greater the curvature of the field lens 840,the narrower/smaller the prism face 831 of the RTIR prism 826 and thesmaller the size of system 150.

Graph B depicts the diameter of the projection lens elements 836 as afunction of the field lens curvature. As can be seen, the greater thecurvature of the field lens 840, the smaller the diameter of theprojection lens elements 836.

Graph C depicts the length of projection lens 872 as a function of thecurvature of field lens 840. As can be seen, the greater the curvatureof the field lens 840, the shorter the length of the projection lens872.

Referring to FIG. 8E, there is shown a method 880 of generating adecentered light beam using the field lens, and of generating a displayimage.

At block 882, the light controller 829 controls the colored lightsources 814 and 816 to selectively generate a red, green and blue (RGB)colored light beam. The light sources are selectively controlled suchthat only one colored light beam 832 is generated at a time.

At block 884, the power prism 824 and the RTIR prism 826 route the lightbeams 832 therethrough. The light beams 832 are internally reflected andprovided to the prism face 831 forming the output 830.

At block 886, the curved field lens 840 decenters the light beams 832from the prism face 831. The curvature of the field lens 840 angles thelight beams 832 at an angle A with respect to the prism face 831 suchthat the angle A is not normal to the prism face 831.

At block 888, the light beams 832 are directed by the field lens 840 tothe display 812 which modulates the light beams 832 to form a visualimage. The center of display 812 is shifted with respect to a center ofthe prism face 831, and the modulated light beams 832 uniformlyilluminate the display. The light image has a downward boresight asshown at 838.

The dimension of illumination section 870 is a function of the curvatureof the curved field lens 840, and the dimension of the projection lens872 is a function of the curvature of the curved field lens 840. Thegreater the curvature of the field lens 840, the smaller the dimensionsof components forming the projector 150 and thus the smaller thedimensions of illumination section 870 and projection lens 872.

FIG. 9 depicts a high-level functional block diagram including exampleelectronic components disposed in eyewear 100 and 200. The illustratedelectronic components include the processor 932, the memory 934, and thesee-through image display 180C and 180D.

Memory 934 includes instructions for execution by processor 932 toimplement functionality of eyewear 100/200, including instructions forprocessor 932 to control in the image 715. Processor 932 receives powerfrom battery 950 and executes the instructions stored in memory 934, orintegrated with the processor 932 on-chip, to perform functionality ofeyewear 100/200, and communicating with external devices via wirelessconnections.

A user interface adjustment system 900 includes a wearable device, whichis the eyewear device 100 with an eye movement tracker 213 (e.g., shownas infrared emitter 215 and infrared camera 220 in FIG. 2B). Userinterface adjustments system 900 also includes a mobile device 990 and aserver system 998 connected via various networks. Mobile device 990 maybe a smartphone, tablet, laptop computer, access point, or any othersuch device capable of connecting with eyewear device 100 using both alow-power wireless connection 925 and a high-speed wireless connection937. Mobile device 990 is connected to server system 998 and network995. The network 995 may include any combination of wired and wirelessconnections.

Eyewear device 100 includes at least two visible light cameras 114A-B(one associated with the left lateral side 170A and one associated withthe right lateral side 170B). Eyewear device 100 further includes twosee-through image displays 180C-D of the optical assembly 180A-B (oneassociated with the left lateral side 170A and one associated with theright lateral side 170B) and a heat sensor 940. Eyewear device 100 alsoincludes image display driver 942, image processor 912, low-powercircuitry 920, and high-speed circuitry 930. The components shown inFIG. 9 for the eyewear device 100 and 200 are located on one or morecircuit boards, for example a PCB or flexible PCB, in the temples.Alternatively, or additionally, the depicted components can be locatedin the temples, frames, hinges, or bridge of the eyewear device 100 and200. Left and right visible light cameras 114A-B can include digitalcamera elements such as a complementary metal-oxide-semiconductor (CMOS)image sensor, charge coupled device, a lens, or any other respectivevisible or light capturing elements that may be used to capture data,including images of scenes with unknown objects.

Eye movement tracking programming 945 implements the user interfacefield of view adjustment instructions, including, to cause the eyeweardevice 100 to track, via the eye movement tracker 213, the eye movementof the eye of the user of the eyewear device 100. Other implementedinstructions (functions) cause the eyewear device 100 and 200 todetermine the FOV adjustment to the initial FOV 111A-B based on thedetected eye movement of the user corresponding to a successive eyedirection. Further implemented instructions generate a successivedisplayed image of the sequence of displayed images based on the fieldof view adjustment. The successive displayed image is produced asvisible output to the user via the user interface. This visible outputappears on the see-through image displays 180C-D of optical assembly180A-B, which is driven by image display driver 942 to present thesequence of displayed images, including the initial displayed image withthe initial field of view and the successive displayed image with thesuccessive field of view.

As shown in FIG. 9, high-speed circuitry 930 includes high-speedprocessor 932, memory 934, and high-speed wireless circuitry 936. In theexample, the image display driver 942 is coupled to the high-speedcircuitry 930 and operated by the high-speed processor 932 in order todrive the left and right image displays 180C-D of the optical assembly180A-B. High-speed processor 932 may be any processor capable ofmanaging high-speed communications and operation of any generalcomputing system needed for eyewear device 100. High-speed processor 932includes processing resources needed for managing high-speed datatransfers on high-speed wireless connection 937 to a wireless local areanetwork (WLAN) using high-speed wireless circuitry 936. In certainexamples, the high-speed processor 932 executes an operating system suchas a LINUX operating system or other such operating system of theeyewear device 100 and the operating system is stored in memory 934 forexecution. In addition to any other responsibilities, the high-speedprocessor 932 executing a software architecture for the eyewear device100 is used to manage data transfers with high-speed wireless circuitry936. In certain examples, high-speed wireless circuitry 936 isconfigured to implement Institute of Electrical and Electronic Engineers(IEEE) 802.11 communication standards, also referred to herein as Wi-Fi.In other examples, other high-speed communications standards may beimplemented by high-speed wireless circuitry 936.

Low-power wireless circuitry 924 and the high-speed wireless circuitry936 of the eyewear device 100 and 200 can include short rangetransceivers (Bluetooth™) and wireless wide, local, or wide area networktransceivers (e.g., cellular or WiFi). Mobile device 990, including thetransceivers communicating via the low-power wireless connection 925 andhigh-speed wireless connection 937, may be implemented using details ofthe architecture of the eyewear device 100, as can other elements ofnetwork 995.

Memory 934 includes any storage device capable of storing various dataand applications, including, among other things, color maps, camera datagenerated by the left and right visible light cameras 114A-B and theimage processor 912, as well as images generated for display by theimage display driver 942 on the see-through image displays 180C-D of theoptical assembly 180A-B. While memory 934 is shown as integrated withhigh-speed circuitry 930, in other examples, memory 934 may be anindependent standalone element of the eyewear device 100. In certainsuch examples, electrical routing lines may provide a connection througha chip that includes the high-speed processor 932 from the imageprocessor 912 or low-power processor 922 to the memory 934. In otherexamples, the high-speed processor 932 may manage addressing of memory934 such that the low-power processor 922 will boot the high-speedprocessor 932 any time that a read or write operation involving memory934 is needed.

Server system 998 may be one or more computing devices as part of aservice or network computing system, for example, that include aprocessor, a memory, and network communication interface to communicateover the network 995 with the mobile device 990 and eyewear device100/200. Eyewear device 100 and 200 is connected with a host computer.For example, the eyewear device 100 is paired with the mobile device 990via the high-speed wireless connection 937 or connected to the serversystem 998 via the network 995.

Output components of the eyewear device 100 include visual components,such as the left and right image displays 180C-D of optical assembly180A-B as described in FIGS. 2C-D (e.g., a display such as a liquidcrystal display (LCD), a plasma display panel (PDP), a light emittingdiode (LED) display, a projector, or a waveguide). The image displays180C-D of the optical assembly 180A-B are driven by the image displaydriver 942. The output components of the eyewear device 100 furtherinclude acoustic components (e.g., speakers), haptic components (e.g., avibratory motor), other signal generators, and so forth. The inputcomponents of the eyewear device 100 and 200, the mobile device 990, andserver system 998, may include alphanumeric input components (e.g., akeyboard, a touch screen configured to receive alphanumeric input, aphoto-optical keyboard, or other alphanumeric input components),point-based input components (e.g., a mouse, a touchpad, a trackball, ajoystick, a motion sensor, or other pointing instruments), tactile inputcomponents (e.g., a physical button, a touch screen that provideslocation and force of touches or touch gestures, or other tactile inputcomponents), audio input components (e.g., a microphone), and the like.

Eyewear device 100 may optionally include additional peripheral deviceelements 919. Such peripheral device elements may include ambient lightand spectral sensors, biometric sensors, additional sensors, or displayelements integrated with eyewear device 100. For example, peripheraldevice elements 919 may include any I/O components including outputcomponents, motion components, position components, or any other suchelements described herein. The eyewear device 100 can take other formsand may incorporate other types of frameworks, for example, a headgear,a headset, or a helmet.

For example, the biometric components of the user interface field ofview adjustment 900 include components to detect expressions (e.g., handexpressions, facial expressions, vocal expressions, body gestures, oreye tracking), measure biosignals (e.g., blood pressure, heart rate,body temperature, perspiration, or brain waves), identify a person(e.g., voice identification, retinal identification, facialidentification, fingerprint identification, or electroencephalogrambased identification), and the like. The motion components includeacceleration sensor components (e.g., accelerometer), gravitation sensorcomponents, rotation sensor components (e.g., gyroscope), and so forth.The position components include location sensor components to generatelocation coordinates (e.g., a Global Positioning System (GPS) receivercomponent), WiFi or Bluetooth™ transceivers to generate positioningsystem coordinates, altitude sensor components (e.g., altimeters orbarometers that detect air pressure from which altitude may be derived),orientation sensor components (e.g., magnetometers), and the like. Suchpositioning system coordinates can also be received over wirelessconnections 925 and 937 from the mobile device 990 via the low-powerwireless circuitry 924 or high-speed wireless circuitry 936.

According to some examples, an “application” or “applications” areprogram(s) that execute functions defined in the programs. Variousprogramming languages can be employed to create one or more of theapplications, structured in a variety of manners, such asobject-oriented programming languages (e.g., Objective-C, Java, or C++)or procedural programming languages (e.g., C or assembly language). In aspecific example, a third-party application (e.g., an applicationdeveloped using the ANDROID™ or IOS™ software development kit (SDK) byan entity other than the vendor of the particular platform) may bemobile software running on a mobile operating system such as IOS™,ANDROID™, WINDOWS® Phone, or another mobile operating systems. In thisexample, the third-party application can invoke API calls provided bythe operating system to facilitate functionality described herein.

During operation, both the projector 150 and the processor 932 generatesignificant amounts of heat. This heat needs to be mitigated such thatthe eyewear 100 can be safely and comfortably operated. In addition, theprojector 150 radiates noise that falls into wireless bands, such as GPSand WiFi.

Referring to FIG. 10A and FIG. 10B, there is shown a pair of thermallyand physically isolated shields 1002 and 1004 configured to encompassprojector 150. FIG. 10B illustrates the projector of FIG. 10A rotated180 degrees. Shield 1002 is physically and thermally coupled to thered/blue LED 814 and the processor 932, and it is configured to sinkheat from them. The shield 1004 is physically and thermally coupled tothe green LED 816 (not shown) and is configured to sink heat from it,and other electronics such as image processor 912. Each of the shields1002 and 1004 are coupled at a respective proximal end to an adapter1006, which may or may not be thermally conductive depending on thethermal design, and they are thermally and physically separated from oneanother. In one example, the shields 1002 and 1004 may be comprised ofcopper or other high thermally conductive material. The LEDs are eachphysically and thermally coupled to the respective shield by a thermalinterface material (TIM), such as Fujipoly® manufactured by Fujipoly ofCarteret, N.J., with a k=13 W/m-k gap pad. As shown, the shield 1002 andthe shield 1004 are parallel to each other, and on opposing sides of theprojector 150 to help thermally and physically isolate them from oneanother.

The thermally and physically isolated shields 1002 and 1004 sink heat inseparate directions to significantly reduce the heat generated ineyewear 100. For instance, the shield 1002 coupled to the red/blue LED814 and processor 932 is thermally connected to the frame 105 and sinksheat in a forward direction, and the shield 1004 coupled to green LED816 is thermally connected to the temple 110 and sinks heat in arearward direction. This will be discussed further in respect to FIG. 12hereafter. The printed circuit board(s) are secured to the shields 1002and 1004 by the shown mounting clips 1008.

Referring to FIG. 11A and FIG. 11B, there is shown the heat sinkingperformance of shield 1002 and shield 1004 during operation of theprojector 150, respectively. As seen in FIG. 11A and FIG. 11B, heat isevenly spread throughout the shield, and heat is much lower in theadapter 1006.

The shields 1002 and 1004 that encompass the projector 150 trap the RFelectromagnetic energy generated by the projector 150, and thus preventelectromagnetic interference (EMI). The shields 1002 and 1004 preventEMI interference with other wireless systems, such as those of theeyewear 100, and external systems that operate in the vicinity.

Referring to FIG. 12, there is shown another example of the adapter 1006having a first planar surface 1010, and a web portion 1012 of the shield1002 thermally and physically coupled to the first planar surface 1012.The adapter 1006 is also seen to have a second planar surface 1014 thatis physically and thermally isolated from the first planar surface 1010such that the heat generated by the respective shields 1002 and 1004 canbe thermally directed away from each other as previously described. Forexample, the first planar surface 1020 is thermally coupled to the frame105, and the second planar surface 1014 is thermally coupled to thetemple 110. With respect to the shield 1002 that is coupled to the LED814, the thickness “T” of the shield 1002 is thicker proximate the LED814 than at other portions of the shield 1002 for improved thermalconductively.

FIG. 13A and FIG. 13B show improved heat sinking performance of shield1002 and shield 1004 during operation of the projector 150,respectively. As seen in FIG. 11A and FIG. 11B, heat is evenly spreadthroughout the shield, and heat is much lower in the adapter 1006.

Referring to FIG. 14, there is shown a method 1400 illustrating theoperation of the heatsink shields 1002 and 1004.

At block 1402, the first heatsink shield 1002 is physically andthermally coupled to the red/blue LED 814, and the processor 932. Thered/blue LED 814 may be coupled to the heatsink shield 1002 by a thermalepoxy or other type of adhesive as previously described.

At block 1404, the second heatsink shield 1004 is physically andthermally coupled to the green LED 816. The green LED 816 may be coupledto the heatsink shield 1004 by a thermal epoxy or other type of adhesiveas previously described. Other electrical components, such as imageprocessor 912, may be coupled to the heatsink shield 1004 by a thermalepoxy or other type of adhesive.

At block 1406, the heat generated by the LEDs 814 and 816 and theprocessor 932 are drawn into the respective heatsink shield 1002 and1004, and into the adapter 1006 and to the eyewear 100, such as to frame105. The heatsink shield 1002 coupled to the red/blue LED 814 andprocessor 932 pulls heat forward to the adapter 1006 and the frame 105.The heatsink shield 1004 coupled to the green LED 816 pulls heat forwardto the adapter 106 and the frame 105. The heat generated by otherelectrical components, such as image processor 912, may also be directedin the eyewear 100. In another example, some heat may also be sunk intothe temple 110. Each of the heatsink shields 1002 and 1004 sufficientlysink heat away from the respective heat generating components such thatthe eyewear 100 is comfortably cool to the user during operation of theprojector 150.

It will be understood that the terms and expressions used herein havethe ordinary meaning as is accorded to such terms and expressions withrespect to their corresponding respective areas of inquiry and studyexcept where specific meanings have otherwise been set forth herein.Relational terms such as first and second and the like may be usedsolely to distinguish one entity or action from another withoutnecessarily requiring or implying any actual such relationship or orderbetween such entities or actions. The terms “comprises,” “comprising,”“includes,” “including,” or any other variation thereof, are intended tocover a non-exclusive inclusion, such that a process, method, article,or apparatus that comprises or includes a list of elements or steps doesnot include only those elements or steps but may include other elementsor steps not expressly listed or inherent to such process, method,article, or apparatus. An element preceded by “a” or “an” does not,without further constraints, preclude the existence of additionalidentical elements in the process, method, article, or apparatus thatcomprises the element.

Unless otherwise stated, any and all measurements, values, ratings,positions, magnitudes, sizes, and other specifications that are setforth in this specification, including in the claims that follow, areapproximate, not exact. Such amounts are intended to have a reasonablerange that is consistent with the functions to which they relate andwith what is customary in the art to which they pertain. For example,unless expressly stated otherwise, a parameter value or the like mayvary by as much as ±10% from the stated amount.

In addition, in the foregoing Detailed Description, it can be seen thatvarious features are grouped together in various examples for thepurpose of streamlining the disclosure. This method of disclosure is notto be interpreted as reflecting an intention that the claimed examplesrequire more features than are expressly recited in each claim. Rather,as the following claims reflect, the subject matter to be protected liesin less than all features of any single disclosed example. Thus, thefollowing claims are hereby incorporated into the Detailed Description,with each claim standing on its own as a separately claimed subjectmatter.

While the foregoing has described what are considered to be the bestmode and other examples, it is understood that various modifications maybe made therein and that the subject matter disclosed herein may beimplemented in various forms and examples, and that they may be appliedin numerous applications, only some of which have been described herein.It is intended by the following claims to claim any and allmodifications and variations that fall within the true scope of thepresent concepts.

What is claimed is:
 1. Eyewear, comprising: a frame; a temple coupled tothe frame; an optical component supported by the frame; and a projector,comprising: a light source configured to generate a light beam; acontroller configured to control the light source; a display configuredto modulate the light beam to generate an image; a first shieldthermally coupled to the light source and configured to sink heatgenerated by the light source; and a second shield thermally coupled tothe controller and configured to sink heat generated by the controller,wherein the first shield and the second shield are thermally isolatedfrom one another.
 2. The eyewear of claim 1, wherein the first shieldand the second shield are disposed on opposite sides of the projector,and together encompass the light source and the controller.
 3. Theeyewear of claim 2, wherein the first shield and the second shield areparallel to each other.
 4. The eyewear of claim 1, wherein the lightsource is coupled to the first shield by a thermal insulating material(TIM).
 5. The eyewear of claim 1, wherein the first shield has a greaterthickness proximate the light source that at a portion disposed awayfrom the light source.
 6. The eyewear of claim 1, wherein the first andsecond shields sink heat in different directions.
 7. The eyewear ofclaim 6, wherein the first shield is coupled to the frame, and thesecond shield is coupled to the temple.
 8. A heat sink configured tocouple to a projector of an eyewear, the projector having a light sourceconfigured to generate a light beam, a controller configured to controlthe light source, and a display configured to modulate the light beam togenerate an image, comprising: a first shield thermally configured tocouple to the light source and configured to sink heat generated by thelight source; and a second shield thermally configured to couple to thecontroller and configured to sink heat generated by the controller,wherein the first shield and the second shield are thermally isolatedfrom one another.
 9. The heat sink of claim 8, wherein the first shieldand the second shield are configured to be disposed on opposite sides ofthe projector, and together encompass the light source and thecontroller.
 10. The heat sink of claim 9, wherein the first shield andthe second shield are parallel to each other.
 11. The heat sink of claim8, wherein the light source is coupled to the first shield by a thermalinsulating material (TIM).
 12. The heat sink of claim 8, wherein thefirst shield has a greater thickness proximate a portion to be coupledto the light source that at a portion disposed away from the lightsource.
 13. The heat sink of claim 8, wherein the first and secondshields sink heat in different directions.
 14. The heat sink of claim13, wherein the first shield is coupled to a frame of an eyewear device,and the second shield is coupled to a temple of the eyewear device. 15.A method of using a projector of an eyewear having a light sourceconfigured to generate a light beam, a controller configured to controlthe light source, a display configured to modulate the light beam togenerate an image, a first shield thermally coupled to the light sourceand configured to sink heat generated by the light source, and a secondshield thermally coupled to the controller and configured to sink heatgenerated by the controller, wherein the first shield and the secondshield are thermally isolated from one another, comprising: the firstshield sinking heat from the light source; and the second shield sinkingheat from the controller.
 16. The method of claim 15, wherein the firstshield and the second shield are disposed on opposite sides of theprojector, and together encompass the light source and the controller.17. The method of claim 16, wherein the first shield and the secondshield are parallel to each other.
 18. The method of claim 15, whereinthe light source is coupled to the first shield by a thermal insulatingmaterial (TIM).
 19. The method of claim 15, wherein the first shield hasa greater thickness proximate the light source that at a portiondisposed away from the light source.
 20. The method of claim 15, whereinthe first and second shields sink heat in different directions.